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Design of an ultralong-life Li-CO2 batteries with IrO2 nanoparticles highly dispersed onto Nitrogen-doped Carbon Nanotubes

Abstract

Li-CO2 batteries have gained tremendous popularity since they not only can realize the eco-friendly utilization of greenhouse gas CO2, but also offer high theoretical energy density. However, they still suffer from several problems, such as high overpotential and poor cycling life. High-efficiency electrocatalysts for carbon dioxide reduction and Li2CO3 decomposition play a critical role in Li-CO2 batteries. In this work, the nitrogen-doped carbon nanotubes modified with ultrafine IrO2 nanoparticles (IrO2-N/CNT) were introduced into the cathode of the Li-CO2 batteries. The batteries with IrO2-N/CNT cathode exhibited high specific capacity (4634 mA h/g), low charge platform and low overpotential (3.95 V/1.34 V), and ultralong cycling life (more than 2500 h/316 cycles at 100 mA/g with the fixed capacity of 400 mAh/g). It is speculated that the high performance of the IrO2-N/CNT cathode is closely related to the super catalytic activity of highly dispersed ultrafine IrO2 nanoparticles and the nitrogen-doped carbon nanotube network, which is not only enhancing the electron conductivity and the capture ability of CNT to Li atoms/CO2, but also promoting reaction between Li+/CO2 and C/Li2CO3. This work paves a promising way to deploying an efficient cathode catalyst for the ultralong-life Li-CO2 batteries.

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Supplementary files

Article information


Submitted
07 Oct 2019
Accepted
09 Jan 2020
First published
11 Jan 2020

J. Mater. Chem. A, 2020, Accepted Manuscript
Article type
Paper

Design of an ultralong-life Li-CO2 batteries with IrO2 nanoparticles highly dispersed onto Nitrogen-doped Carbon Nanotubes

G. Wu, X. Li, Z. Zhang, P. Dong, M. Xu, H. Peng, X. Zeng, Y. Zhang and S. Liao, J. Mater. Chem. A, 2020, Accepted Manuscript , DOI: 10.1039/C9TA11028C

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